Question

Thread1/2: do TotalThreads– on their exit

int TotalThreads = 2;

void AsyncFunc() {
 // run thread for Func()
}

void Func() {
 // run Thread1 
 // run Thread2
 while(TotalThreads > 0) { /* do nothing */ }
 // some code
}  

is that bad design?

Answer 1

If you are creating new threads using System.Threading.Thread, you can use Thread.Join on each thread instance. This will block the main thread until the running threads have completed.

Based on your comments, this example should match your requirement.

using System;
using System.Threading;

namespace ConsoleApplication1
{
  class Program
  {
    [STAThread]
    static void Main(string[] args)
    {

      Thread t1 = new Thread(new ThreadStart(AsyncFunc));
      Thread t2 = new Thread(new ThreadStart(AsyncFunc));

      t1.Start();
      t2.Start();

      // Wait here for the 2 threads to complete
      t1.Join();
      t2.Join();

      Console.WriteLine("Done");
      Console.ReadKey();
    }


    static void AsyncFunc()
    {
      Thread.Sleep(2000);
    }

  }
}